Java序列化与反序列化

〔转自：http://www.blogjava.net/sxyx2008/archive/2009/11/09/301663.html〕

首先解释两个概念,何为序列化?何为反序列化?序列化:将对象转化成流的过程称为序列化反序列化:将流转化成对象的过程称之为反序列化序列化与反序列化必须遵守的原则a)         Java对象在java中要想使一个java对象可以实现序列化与反序列化,必须让该类实现java.io.Serializable接口java.io.Serializable接口定义如下:publicinterface Serializable {} 从上述定义中可以看到该接口中未定义任何方法,这大大的简化了开发者b)      序列化主要依赖java.io.ObjectOutputStream类,该类对java.io.FileOutputStream进一步做了封装,这里主要使用ObjectOutputStream类的writeObject()方法实现序列化功能

Demo:

// 用序列化与反序列化实现深克隆  
    public Object deepClone(Object src)  
    {  
        Object o = null;  
        try  
        {  
            if (src != null)  
            {  
                ByteArrayOutputStream baos = new ByteArrayOutputStream();  
                ObjectOutputStream oos = new ObjectOutputStream(baos);  
                oos.writeObject(src);  
                oos.close();  
                ByteArrayInputStream bais = new ByteArrayInputStream(baos  
                        .toByteArray());  
                ObjectInputStream ois = new ObjectInputStream(bais);  
                o = ois.readObject();  
                ois.close();  
            }  
        } catch (IOException e)  
        {  
            e.printStackTrace();  
        } catch (ClassNotFoundException e)  
        {  
            e.printStackTrace();  
        }  
        return o;  
    }  
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝/**     *将对象序列化到磁盘文件中     *@paramo     *@throwsException     */    publicstaticvoid writeObject(Object o) throws Exception{       File f=new File("d:""user.tmp");       if(f.exists()){           f.delete();       }       FileOutputStream os=new FileOutputStream(f);       //ObjectOutputStream 核心类       ObjectOutputStream oos=new ObjectOutputStream(os);       oos.writeObject(o);       oos.close();       os.close();    } c)      反序列化主要依赖java.io.ObjectInputStream类,该类对java.io.InputStream进一步做了封装,这里主要使用ObjectInputStream类的readObject()方法实现序列化功能Demo:/**     *反序列化,将磁盘文件转化为对象     *@paramf     *@return     *@throwsException     */    publicstatic User readObject(File f) throws Exception{       InputStream is=new FileInputStream(f);       //ObjectOutputStream 核心类       ObjectInputStream ois=new ObjectInputStream(is);       return (User)ois.readObject();    } 贴出完整的demoJava对象:package com.io.bean;import java.io.Serializable;publicclass User implements Serializable {        privateintuserId;    private String userName;    private String userSex;    privateintuserAge;    publicint getUserAge() {       returnuserAge;    }    publicvoid setUserAge(int userAge) {       this.userAge = userAge;    }    publicint getUserId() {       returnuserId;    }    publicvoid setUserId(int userId) {       this.userId = userId;    }    public String getUserName() {       returnuserName;    }    publicvoid setUserName(String userName) {       this.userName = userName;    }    public String getUserSex() {       returnuserSex;    }    publicvoid setUserSex(String userSex) {       this.userSex = userSex;    }    @Override    public String toString() {       returnthis.getUserId() + "   " + this.getUserName() + "   "              + this.getUserSex() + "    " + this.getUserAge();    }} 序列化与反序列化package com.io.test;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import com.io.bean.User;publicclass TestSerializable {    /**     *将对象序列化到磁盘文件中     *@paramo     *@throwsException     */    publicstaticvoid writeObject(Object o) throws Exception{       File f=new File("d:""user.tmp");       if(f.exists()){           f.delete();       }       FileOutputStream os=new FileOutputStream(f);       //ObjectOutputStream 核心类       ObjectOutputStream oos=new ObjectOutputStream(os);       oos.writeObject(o);       oos.close();       os.close();    }        /**     *反序列化,将磁盘文件转化为对象     *@paramf     *@return     *@throwsException     */    publicstatic User readObject(File f) throws Exception{       InputStream is=new FileInputStream(f);       //ObjectOutputStream 核心类       ObjectInputStream ois=new ObjectInputStream(is);       return (User)ois.readObject();    }            publicstaticvoid main(String[] args) throws Exception{              /*****************将对象序列化***************/           /*         User user=new User();       user.setUserId(1);       user.setUserName("张艺谋");       user.setUserSex("男");       user.setUserAge(50);       TestSerializable.writeObject(user);    */              /*****************将对象序反列化***************/              User user=TestSerializable.readObject(new File("d:""user.tmp"));       System.out.println(user);    }}